I went for the 'Touring' option which are the 3.9 amp version, and not the crummy 3.0 or 3.2 amp Oxfords that Col Kawasaki fit. I can tell you they are brilliant and get much hotter than the less powerful ones! I'm still recovering from being ill before Xmas but did go out on the bike yesterday and it was very cold. I put the grips on to 80% power and after 4 miles the grips were hot! I was cruising at 65mph most of the time but even the backs of my leather gloves started to get warm. On my GTS I have no hand guards to deflect wind from my hands but even after 45 miles my gloves were really hot and the backs of the gloves were warm. The heat was travelling around my gloves wonderfully. Of course, heated grips take a bit longer to transfer the heat to your hands whereas the heated gloves probably do that a bit quicker and more evenly.
My point in mentioning all this is the cost. My grips are very effective, and I think probably the best Oxfords I've had. Certainly kept my hands as warm as heated gloves that I had years ago when I was motorcycling near 40k miles a year all over the continent.
If you change your mind and want heated grips but haven't got your discount card, then let me know and I'll get them for you.